Engine-cooling system



Nov. 1o, 1925.

`J..v. GlEsLER v f H ENGINE COOLING SYSTEM Filed Aug, '19'.- 1916 Patented Nov. l0, 1925.

OFFICE.

-J'EAN V. GIESLER, 0F KNOXVDLLE, TENNESSEE, ASSIGNOR TOTHE FULTON COMPANY,

F KNOXVILLE, TENNESSEE, A CORPRATION 0F MAINE. l

ENGINE-090.14m@ SYSTEM.

pplication iled August 10, 1916. Serial No. 115,865.

- an improved system of the type referred to wherein likelihood of the cooling medium freezing in the radiator is lessened by utilization of the fact that a fluid while in motion is less likely to freeze than while not in motion. A further object of this invention is to provide an improved system of the type characterized wherein a contlnnous circulation of the cooling medium 1s maintained through the radiator of the system, and the circulation through the jacket or jackets of the engine is controlled and` proportioned tothe needs of the system as determined by the tem erature of the cooling medium. Other o jects relate to the provision of a cooling system that is simple and compact in construction, inex ensive to manufacture and install, and e cient in operation. Stated broadly, the invention comprises a cooling system including the en ine jacket or jackets, a radiator, ,a conduit between the outlet of said jacket or jackets and. the inlet` of said radiator, a`

pump communicating with rthe outlet of said radiator and having connections with said conduit and the-inlet of said jacket or jackets, valve mechanism for respectively controllin the circulation of cooling medium throng said jacket or jackets and the connections around the same, and thermosensi- I tive means, preferably subjected to the temperature of said cooling medium as it leaves the engine jacket or jackets, for actuating' said valve mechanism to permit circulation of thefcooling medium through said jacket or jackets only when said medium has attained a predetermined temperature, al-

though circulation of cooling medium isy maintained through the radiator all of the l 'time that the engine is running. The invention issusceptible of embodiment in a variety of mechanical forms, one of which, for the urpose of illustration, has been shown on t e accompanying drawing. But it is to be expressly understood that such drawin is for purposes of illustrationonly, and 1s not to be 4construed as a definition of the limits of 5the invention, ref erence being had to the appended claimsfor that purpose.

In the drawing,

Fig. 1 represents an elevation, partly in section, of an internal combustion engine provided with a cooling system embodying the present invention.

Fig. 2 is a cross section on the line AB of Fig. 1.

In the form shown, 1 represents an engine as the usual or any preferred form of Vinternal combustion engine commonly employed in automobiles. The engine is provided with the usual jacket or jackets i through which is circulated a cooling medium to maintain the cylinders at the proper temperature forthe most eilicient operatlon of the engine. 2 represents the inlet manifold to the jackets, and 3 the outlet manifold therefrom. 4 is any conventional form of radiator, 5 any suitable form of pump for maintaining a circulation through the system, and6 a conduit connecting the outlet of the radiator with the inlet ofthe pump, the manifold 3 communicating. with the inlet to the radiator through a 'conduit 7 and a valve housin 8.A 9 is a conduit he tween the valve housing 8 and a T-coupling 10 which is also connected with the outlet of the pump and the inlet of the manifold 2.

Means are provided for controlling the circulation of the coolin medium through the engine jacket or jac ets, and the conduit. To this end the valve housing is provided with a valve port 11 for controlling outow of the cooling medium from the engine 'jacket or jackets, and a valve port .12 for controlling flow of the cooling 1 medium throu h the conduitl9. Any suitable ty e` of va ve may be employed. In the form s own the valve member 13, adapted to close port 11, has connected therewith,

referably inte ally, a piston valve memerv 14 provide with an opening 15 which may register with the valve port 12 when valve port 11 is closed by member 13. l

.Thermosensitive means are provided for actuating the aforesaid valves, such means no "force, and is preferably constructed of a resilient metal so that the same is possessed of anA inherent elasticity, and such vessel is charged with a ther'mosensitive or volatile fluid, preferably at a pressure below that to which the vessel is normally exteriorly4 subjected. The elasticity inherent in or acting on such vessel is of itself sufiicient to` operate the valves 13 and 14 whereby, upon equalization of the pressure within and without the vessel, as would happen if a leak occurred in the vessel, the elastic force will cause an expansion of the vessel, move valve 13 to wide open position, thereby providing for a maximum circulation through the jacket or jackets of the engine to prevent overheating of the same.

In order that there shall be all all times a small circulation of the cooling medium past the thermosensitive device, a small aperture 20 is preferably provided in the partition constituting the seat of valve 13, and forms a by-pass around the valve 13.

.When thel engine is started, the cooling medium of the system will normally be at the` same temperature as the outside air. The expansible and collapsible vessel 16 will accordingly be contracted, maintaining valve port 11` closed and aperture 15 in register with port 12, whereby conduit 9 is 1n complete communication with the radiator 4. Pump 5 will then withdraw the cool-- ing medium from the radiator 4 through conduit 6, and deliver the same through T- coupling 10, conduit 9, opening 15 and conduit 7 back to the radiator. Thereby is maintained a circulation of the cooling medium through the radiator,` and such medium, being in motion, is less likely to freeze in the radiator than if it stood stationary therein. The friction of the coolin medium on the walls of the passages throug the conduits and radiator, and the ener of the pump expended in churning suc medium, etc., also tend to increase the temperature of said cooling medium to prevent reezing thereof. Owing to the aperture 20,

there will also be a small circulation through the jacket or jackets past the thermosensitive device 16, and this medium heated in its passagethrough said jacket or jackets will be delivered to and mingle with the medium circulation through the radiator 4 and conduit 9, slightly raising the temperature thereof.

As soon as the temperature of the medium in the jacket of jackets rises to a degree proper for the most efficient operati-on of the engine,and at which vdegree the thermosensitive device is designed to become responsive, the expansible and collapsible vessel 16 will begin to expand, proportionately opening valve port 11 and moving aperture 15 out of register with port 12', thereby proportioning the circulation through the jacket or jackets and the connections there around conduit 9 in accordance with the needs of the system as determined by the temperature of the medium leaving the jacket or jackets. A continued rise in temperature of the medium will cause further expansion of the vessel until eventually the valve port 11 is wide open and .valve member 14 entirely closes port 12. It is therefore seen that a cooling system has been provided wherein a circuit is maintained which includes a radiator and either the engine jacket or jackets or connections around the jacket or jackets, together with valve means automatically controlled for proportioning the circulation through the jacket or jackets ,and the connections therearound in accordance with the needs of the system, av continuous circulation of the cooling medium being maintained through the radiator at all times.

While the illustrated embodiment has been described in considerable detail, it is to be expressly understood that the present invention is not to be restricted to the precise form shown on the drawing, as it is capable of receiving a variety of mechanical expressions, some of which will readily suggest themselves to those skilled in the art, while vcertain features thereof are capable of use without other features thereof. Reference is therefore to be had to the claims hereto appended for a definition of the limits of the invention.

What is claimed is:

1. In a cooling system for an internal combustion engine, in combination with the en ine jacket or jackets, a radiator, a condult leading from the outlet ofsaid jacket or jackets to the inlet of said radiator, a circulating pump, a conduit leading from the outlet of said radiator to the inlet of said pump, a conduit leading from the outlet of said pump to said first-named conduit, connections from the outlet of said pump to the inlet of said jacket or jackets, Valve mechanism for respectively controlling the flow of cooling medium through said last-named conduit and said jacket or jackets, and ther'mosensitive means for actuating said valve mechanism to permit circulatlon of said cooling medium through said jacket or jackets only when saidy medium has attained a predetermined temperature, Vsaid thermosensitive means comprising an expansible and collapsible vessel normally contracted against an elastic force and charged with a thermosensitive fluid at a pressure below that to which it is normally subjected exterior-l so.that upon leakage of said vessel it will expand and move said valve mechanism to a position permitting circulation of the cooling medium through said jacket or `jackets. l

2. In Aa device ofthe cla described the vcombination of avradiator, an engine Water jacket, an upper conduit connecting the to of t e water jacket and the bottom of the radiator, a by-pass conduit connecting the .upper conduit and the inlet pipe, a main valve in the upper conduit operable by a thermostat to interrupt communication' from the top of the water 'acket and to the radiator and by-pas's, a'n an auxiliary valve for the byass adapted to open when the main .valve c oses.

3. In a device of the class described the combination of a radiator, an engine water jacket, an upper conduit connecting the top, of the water jacket and the top of the radv1- ator,` an inlet pipe connecting the bottom of the water jacket and the bottom of the radiator; a pump in the inlet pipe, a bypass conduit connecting the pump outletwith the upper conduit, a thermostatically operated valve in the upper conduit for interrupting communication from the to 'of ,the water jacket to the top of the radiator .and an auxiliary valve for the by-pass adapted to open when the main valve closes. In testimony whereof I have signed this specification.

JEAN V. GIESLER.

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